The `CustomFileDialog` class had become too large and complex, making it difficult to maintain.
This change refactors the monolithic class into several specialized manager classes, each responsible for a specific area of concern:
- `SettingsDialog`: Moved to its own file, `cfd_settings_dialog.py`.
- `FileOperationsManager`: Handles file/folder creation, deletion, and renaming.
- `SearchManager`: Encapsulates all search-related logic.
- `NavigationManager`: Manages directory navigation and history.
- `ViewManager`: Controls the rendering of file and folder views.
The main `CustomFileDialog` class has been streamlined and now acts as an orchestrator for these managers. This improves readability, separation of concerns, and the overall maintainability of the code.
